Obesity remains a serious health problem and it is no secret that many people want to lose weight. Behavioral economists typically argue that “nudges” help individuals with various decisionmaking flaws to live longer, healthier, and better lives. In an article in the new issue of Regulation, Michael L. Marlow discusses how nudging by government differs from nudging by markets, and explains why market nudging is the more promising avenue for helping citizens to lose weight.

Armed with a computer model in 1935, one could probably have written the exact same story on California drought as appears today in the Washington Post some 80 years ago, prompted by the very similar outlier temperatures of 1934 and 2014.

Two long wars, chronic deficits, the financial crisis, the costly drug war, the growth of executive power under Presidents Bush and Obama, and the revelations about NSA abuses, have given rise to a growing libertarian movement in our country – with a greater focus on individual liberty and less government power. David Boaz’s newly released The Libertarian Mind is a comprehensive guide to the history, philosophy, and growth of the libertarian movement, with incisive analyses of today’s most pressing issues and policies.

I want to pitch to the credit card and financial industry a new innovative online survey. It is targeted for older, more mature long-time users of our services. We’ll give a $10 credit for anyone who completes it. Here is a sense of what the questions will look like:

- 1) What is your age?
- 2) What day of the week are you taking this survey?
- 3) Many rewards offered are for people with more active lifestyles: vacations, flights, hotels, rental cars. Do you find that your rewards programs aren’t well suited for your lifestyle?
- 4) What is the current season where you live? Are any seasons harder for you in getting to a branch or ATM machine?
- 5) Would rewards that could be given as gifts to others, especially younger people, be helpful for what you’d like to do with your benefits?
- 6) Would replacing your rewards program with a savings account redeemable for education for your grandchildren be something you’d be interested in?
- 7) Write a sentence you’d like us to hear about anything, good or bad!
- 8 ) How worried are you you’ll leave legal and financial problems for your next-of-kin after your passing?

Did you catch it? Questions 1,2,4,7 are taken from the ‘Mini-mental State Examination’ which is a quick test given by medical professionals to see if a patient is suffering from dementia. (It’s a little blunt, but we can always hire some psychologist and marketers for the final version. They’re cheap to hire.) We can use this test to subtly increase limits, and break out the best automated tricks and traps mechanisms, on those whose dementia lights up in our surveys. Anyone who flags all four can get a giant increase in balance and get their due dates moved to holidays where the Post Office is slowest! We’d have to be very subtle about it, because there are many nanny-staters out there who’d want to coddle citizens here…

I smell money – it’s like walking down a sidewalk and turning a corner and then there is suddenly money all over the sidewalk. One problem with hitting up sick people, single mothers, college kids who didn’t plan well and the cash-constrained poor with fees and traps is that they’re poor. Hitting up people with a lifetime of savings suffering from dementia is some real, serious money we can tap as a revenue source.

Clearly, only an evil person (or a libertarian!) would allow a scam like this one. Megan responds, I think rightly:

I’m not sure why this is supposed to be a hard question for libertarians. I mean, I might argue that preventing people from ripping off the marginally mentally impaired would, in practice, be too difficult. Crafting a rule that prevented companies from identifying people who are marginally impaired might well be impossible – I’m pretty sure that if I wanted to, I could devise subtler tests than “What day of the week is it?” And while the seniors lobby is probably in favor of not ripping off seniors, they’re resolutely against making it harder for seniors to do things like drive or get credit, which is the result that any sufficiently strong rule would probably have.

But it’s pretty much standard libertarian theory that you shouldn’t take advantage of people who do not have the cognitive ability to make contracts. Marginal cases are hard not because we think it’s okay, but because there is disagreement over what constitutes impairment, and the more forcefully you act to protect marginal cases, the more you start treating perfectly able-minded adults like children.

The elderly are a challenge precisely because there’s no obvious point at which you can say: now this previously able adult should be treated like a child. Either you let some people get ripped off, or you infringe the liberty, and the dignity, of people who are still capable of making their own decisions.

I’d add two responses of my own.

First, I can’t believe there’s all that much money to be had here. Anyone who wanders into Tiffany’s and back out again without remembering what they bought is, generally speaking, a bad credit risk. Mildly irresponsible people – those who slightly overspend, then have to make it up later – those are probably great for creditors. Lesson learned: If you’re not demented, don’t be irresponsible. (If you are demented, you’re not going to follow my advice anyway.)

Second, I am always amazed at how border cases are dragged out, again and again, as if they proved something against libertarianism. Border cases – How old before you can vote? How demented before a contract doesn’t bind? – are a problem in all political systems, because all systems start with a presumed community of citizens and/or subjects. We always have to draw boundaries between the in-group and the outliers before we have a polity in the first place.

What makes the classical liberal/libertarian approach so valuable is in fact that it draws so few boundaries. Where other systems depend on class boundaries, race boundaries, religious boundaries, and so forth – with annoying boundary issues at every stop along the way – libertarians make it as simple as I think it can be. We presume that all mentally competent adults are worthy of liberty until they prove themselves otherwise.

The boundary cases are still there, but they are fewer and more tractable. Konczal just wandered into one of them. It proves much less than he thinks.

A Swedish conservative columnist recently expressed surprise - she found it strange that I am still a classical liberal even though I have discovered family happiness and love my son. But she hoped that I would change my mind if I got a daughter: “A conservative is a libertarian with daughters.”

Well, we are about to find out. Because this weekend, my wife gave birth to the cutest little girl I’ve ever seen. They’re both in great condition and so far Alexander is just happy and curious about the little gift we brought from the maternity hospital.

Obviously, I will focus on the family in the coming weeks, so my activity here and elsewhere will be reduced. So any conservative symptoms yet? Well, preliminarily I can only say that I am delighted that she is born into a part of the world and in an era when women have greater freedoms and more equality than they have ever had anywhere else, as a result of liberal reforms over the last 150 years - reforms that conservatives objected to.

Congratulations, Johan and Sofia. And remember: the best conservatives are the ones who embrace and defend the advances that libertarians (liberals) fought for.

Tax competition is an issue that arouses passion on both sides of the debate. Libertarians and other free-market advocates welcome tax competition as a way of restraining the greed of politicians. Governments have lowered tax rates in recent decades, for instance, because politicians are afraid that the geese that lay the golden eggs can fly across the border. But collectivists despise tax competition – for exactly the same reason. They want investors, entrepreneurs, and companies to passively serve as free vending machines, dispensing never-ending piles of money for politicians. So when a left-wing group puts together a ranking of the world’s “top secrecy jurisdictions” in hopes of undermining tax competition, proponents of individual freedom can use that list as a guide to world’s most investor-friendly nations. The good news is that an American state, Delaware, is number one on the list. And since being a tax haven is a magnet for investment, this is good news for U.S. competitiveness. The bad news is that American taxpayers are not allowed to benefit from many of Delaware’s “tax haven” policies. Here’s what a left-wing columnist in the United Kingdom wrote about the issue:

You’re a billionaire but you don’t want anyone, least of all the taxman, to know. What do you do? Head for a palm-fringed island paradise or a snow-covered Alpine micro-state? Wrong. The world’s most opaque jurisdictions – the ones that will best shield you and your cash from the light – are mostly in the heart of the most sophisticated and powerful global financial centres. London, Luxembourg and Zurich are in the top five most secretive jurisdictions, according the first comprehensive index of financial transparency ever compiled. Yet top of the pile, beating the British Virgin Islands, Belize or Liechtenstein as the best place to hide wealth, is Delaware. One of the smallest states in the US, it offers the best protection for anyone who does not want to disclose their identity as a beneficial owner of a company. That is one very good reason why the East Coast state hosts 50% of the US’s quoted firms and 650,000 companies – almost equivalent to one company per Delaware resident. …Delaware – the political power-base of the US vice-president, Joe Biden – offers high levels of banking secrecy and does not make details of trusts, company accounts and beneficial ownership a matter of public record. Delaware also allows companies to re-domicile within its borders with minimal disclosure, and allows the existence of privacy-enhancing “protected cell” or “segregated portfolio” companies, among many other stratagems useful for protecting the identity of those who do business there.